var b = new Array;

function prel(){
	b[0] = new Image();
	b[0].src = 'images/buttons/b1_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b2_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b3_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b18_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b20_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b21_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b22_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b23_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b24_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b25_o.gif';
	b[0] = new Image();
	b[0].src = 'images/buttons/b26_o.gif';
}

function on(im){
	document.images[im].src="images/buttons/"+im+"_o.gif";
}

function off(im){
	document.images[im].src = "images/buttons/"+im+".gif";
}